Low complexity demapping algorithms survey in DVB-T2: Rotated constellation case study

By Anne-Carole HONFOGA, Michel DOSSOU, Véronique MOEYAERT


Signal Space Diversity (SSD) technique was adopted
in Digital Video Broadcasting-Terrestrial, second generation
(DVB-T2) standard ten years ago to increase system performance
over fading channels. This technique consists of rotated and
cyclic Q-delayed M-Quadrature Amplitude Modulation (QAM)
and has been proposed without considering the complexity
induced by the demapper. "Genie Aided" demapping algorithm
based on iterative demapping has been presented in DVB-T2
and lets this system approach the Shannon limit. Furthermore,
this algorithm is not suitable for hardware implementation.
Due to the complexity of the hardware implementation algo�rithms, the advantages of this rotated constellation have not
been effectively exploited for network deployment. Moreover,
receivers provided by manufacturers do not include suitable
demappers when this technique is applied. Therefore, several low
complexity algorithms have been proposed during the last decade
in the scientific literature to reduce the number of metrics and
operators used in the demapping process. This paper presents
an exhaustive review of demappers proposed for DVB-T2 and
all the low complexity demapping algorithms existing up to now
in the literature that is suitable for hardware implementation.
Details about these algorithms are given in terms of reduction,
parameters, performance and percentage of reduction obtained.

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International Journal of Information Science and Technology (iJIST) – ISSN: 2550-5114